[Forman450s]

I just had the same problem with mine. I built mine and found out by process of elimination that the vent coming off the top of your carb. has to be ran by itself. The second i took mine off and reran it i had no problems and didnt have to readjust anything.

 

[Forman450s]

what size hose did you use? and what size is the snorkle tubing. i had to reduce mine from 1 1/2 to one inch.

 

[Forman450s]

nope no jet kit. my bike runs perfect accept for when im at a low idle speed and pop the throttle, itll kinda bog down on me but comes right back up. ill have to post a picture as soon as i put them on my computer. i used all 1 1/2 pvc for my snorkle and a reducing 90 from 1 1/2 to 1inch